Bump express from 4.17.1 to 4.17.3 in /03 Expressjs/Topic4/Code/TODO App

Bumps [express](https://github.com/expressjs/express) from 4.17.1 to 4.17.3.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.17.1...4.17.3)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

03 Expressjs/Topic4/Code/TODO App/package-lock.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "body-parser": "^1.18.0",
     "ejs": "^3.1.7",
-    "express": "^4.15.4"
+    "express": "^4.17.3"
   }
 }